Bevel-square rule.



UNITED STATES PATENT 'IFFICE THOMAS S. ROSS, OF BALTIMORE, MARYLAND,ASSIGNOR OF ONE-THIRD TO MICHAEL H. NOON AND ONE-THIRD TO JAMES J.ELLIS.

Specification of Letters Patent.

Patented April 1'7, 1906.

Application filed November 14, 1905. Serial No. 237.213.

To all whom t may concern:

Beit known that I, THOMAS S. Ross, a citi- Zen of the United States,residing in Baltimore city and State of Maryland, have invented certainnew .and useful Improvements in Bevel-Squares, of which the following isa specification.

My invention relates to an improvement in bevel-square rules, the objectof which is to supply a rule which is accurate and which can be adjustedquickly, and when once adjusted can be permanently held without dangerof slipping while being used in the execution of similar purposes forwhich it was originally adjusted. At the same time by the use of myinvention the same results can be obtained without the use of severalseparate and distinct drafting instruments whichwould otherwise berequired.

With the foregoing object in view my invention consists in certain novelfeatures of construction and combinations of parts which will behereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a perspective view of myinvention. Fig. 2 is a longitudinal sectional view. Fig. 3 is a view ofthe slide. Fig. 4 is the reversed view of the slide, showing thedepression thereon. Fig. 5 is a view of a concave washer.

In Fig. 1, A is a rule-blade provided with a scale 1 and 2, on eachbeveled edge. B is a slide, the edges of which are rolled over so as toform the grooves 3 3, adapted to allow the rule-blade A to slide andsnugly fit therein. C is the stock, provided with a scale 4.

In Fig. 2, O is the stock, (without the scale therein being shown, as inFig. 1,) in the center of which is fitted the metal disk D, which isprovided with the recesses 6 6, held securely in position by the screws7 7 and countersunk so as to be flush with the surface of the stock C. 8is a circular hole extending through the disk D and through the stock C.9 is a washer.

Fig. 4 is the reverse view of Fig. 3, showing the circular hole 10 andthe extension 11, which can be made by a depression in the reverse side.Fig. 5 shows the rivet concave head 12 with the stem 13.

In assembling the several parts to form my invention the stock C isprovided and fitted with the disk D. As heretofore explained, the slide,as shown in Figs. 3 and 4, is then placed thereon with the extension" 11,as shown in Fig. 4, placeddownward, so as to engage one of the recesses6 6 of the disk D. The rivet, as shown in Fig. 5, is then insertedthrough the hole in the stock and 8 of the disk D with the concave headthereof (which is made of thin sheet metal) on the under side of thestock D, the stock being countersunk sufficiently to receive it, s o asto be flush with the under surface. The washer 9 is then placed on thestem of the rivet so inserted and the slide B placed thereon by allowingthe stem of the rivet to pass through the hole 10. The stern of thewasher is then headed, and the parts named are then securely heldtogether. The blade A is then inserted into the slide and held by meansof the grooves 3 3, as shown in Fig. 1. By reason of the construction ofthe concave head of the rivet, as shown in Fig. 5, it being made of thinspringy material, there is sufficient resiliency to allow the extension11 of Fig. 4 to lift out of the recesses 6 6 and pass from one recess toanother; also there is sufficient spring in the head of the rivet tohold the extension 11 into any of the desired recesses 6 6 sufficientlystrong to guard against Vaccidental displacement.

From the foregoing it will be seen that I have provided a simple devicefor purposes usually requiring more or less additional instruments,thereby reducing the cost and the saving of time in the use thereof,insuring its adoption.

Slight changes might be resorted to in the form and arrangement of theseveral parts described without departing from the spirit and scope ofmy invention, and hence I do not desire to limit myself to the exactconstruction as herein set forth; but,

Having fully described my invention, what I claim and desire to secureby Letters Patent, is-

1. In abevel-square rule comprising a stock having a scale thereon incombination with a blade provided with beveled edges and scale, theblade being fitted in a guide, the guide being attached to the stock bymeans of a rivet and a concave washer substantially as described.

2. In abevel-square rule comprising a stock having a scale thereon, adisk with recesses secured to the top part of the stock, a guide with aprojection on the under side thereof to engage in the recesses of thedisk, the lateral edges being bent upwardly and inwardly to form grooveswherein the blade is fitted to the guide which is attached to the stockby means of a rivet and concave washer, substantially as described.

3. In a bevel-square rule comprising a stock with scale thereon, a flatdisk attached in the top part thereof and having recesses formed nearits outer edges, in combination with a guide having a projection formedon the under side thereof to engage the recesses in the disk, itslateral edges being bent upwardly and inwardly to form grooves wherein ablade with beveled edges and scale thereon is fitted, the guide beingattached to the stock by means of a rivet and concave washersubstantially as described.

4. `A bevel-square rule comprising a stock, a circular disk attached tothe upper part thereof by suitable means, and provided with recessesnear its outer edges, a guide having a projection on the under sidethereof for the purpose of engagin in the recesses oi the disk, thelateral edges o the` Sides being bent upwardly and inwardly to formgrooves inwhich a rule-blade is fitted, said slide being attached to thestock by means of a rivet and concave washer substantially as described.

In testimony whereof I affix my signature 3o in presence of twoWitnesses.

THOMAS S. ROSS.

Witnesses JOHN F. SCHULZ, MARY M. MAGRAW

